package kr.hkit.powerjava.chapter22.collection;

import java.util.*;

public class WordFreq {
	public static void main(String[] args) {
		Map<String, Integer> m = new HashMap<String, Integer>();
		
		String[] sample = {"to", "be", "or","not","to","be","is","a","problem"};
		
		for(String a: sample){
			Integer freq = m.get(a);
			m.put(a,freq == null? 1 : freq + 1);
		}
		
		System.out.println(m.size() + "단어가 있습니다");
		System.out.println(m.containsKey("to"));
		System.out.println(m.isEmpty());
		System.out.println(m);
	}
}
